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https://www.readbyqxmd.com/read/28087945/innate-immune-responses-to-tuberculosis
#1
Jeffrey S Schorey, Larry S Schlesinger
Tuberculosis remains one of the greatest threats to human health. The causative bacterium, Mycobacterium tuberculosis, is acquired by the respiratory route. It is exquisitely adapted to humans and is a prototypic intracellular pathogen of macrophages, with alveolar macrophages being the primary conduit of infection and disease. However, M. tuberculosis bacilli interact with and are affected by several soluble and cellular components of the innate immune system which dictate the outcome of primary infection, most commonly a latently infected healthy human host, in whom the bacteria are held in check by the host immune response within the confines of tissue granuloma, the host histopathologic hallmark...
December 2016: Microbiology Spectrum
https://www.readbyqxmd.com/read/28086846/stochastic-agent-based-modeling-of-tuberculosis-in-canadian-indigenous-communities
#2
Ashleigh R Tuite, Victor Gallant, Elaine Randell, Annie-Claude Bourgeois, Amy L Greer
BACKGROUND: In Canada, active tuberculosis (TB) disease rates remain disproportionately higher among the Indigenous population, especially among the Inuit in the north. We used mathematical modeling to evaluate how interventions might enhance existing TB control efforts in a region of Nunavut. METHODS: We developed a stochastic, agent-based model of TB transmission that captured the unique household and community structure. Evaluated interventions included: (i) rapid treatment of active cases; (ii) rapid contact tracing; (iii) expanded screening programs for latent TB infection (LTBI); and (iv) reduced household density...
January 13, 2017: BMC Public Health
https://www.readbyqxmd.com/read/28079759/the-quantiferon-tb-gold-in-tube-assay-in-neuro-ophthalmology
#3
Leanne M Little, Mohammed Rigi, Ayman Suleiman, Stacy V Smith, Edward A Graviss, Rod Foroozan, Andrew G Lee
BACKGROUND: Although QuantiFERON-TB Gold In-Tube (QFT-GIT) testing is regularly used to detect infection with Mycobacterium tuberculosis, its utility in a patient population with a low risk for tuberculosis (TB) has been questioned. The following is a cohort study analyzing the efficacy of QFT-GIT testing as a method for detection of active TB disease in low-risk individuals in a neuro-ophthalmologic setting. METHODS: Ninety-nine patients from 2 neuro-ophthalmology centers were identified as having undergone QFT-GIT testing between January 2012 and February 2016...
January 11, 2017: Journal of Neuro-ophthalmology: the Official Journal of the North American Neuro-Ophthalmology Society
https://www.readbyqxmd.com/read/28076011/pulmonary-tuberculosis-role-of-radiology-in-diagnosis-and-management
#4
Arun C Nachiappan, Kasra Rahbar, Xiao Shi, Elizabeth S Guy, Eduardo J Mortani Barbosa, Girish S Shroff, Daniel Ocazionez, Alan E Schlesinger, Sharyn I Katz, Mark M Hammer
Tuberculosis is a public health problem worldwide, including in the United States-particularly among immunocompromised patients and other high-risk groups. Tuberculosis manifests in active and latent forms. Active disease can occur as primary tuberculosis, developing shortly after infection, or postprimary tuberculosis, developing after a long period of latent infection. Primary tuberculosis occurs most commonly in children and immunocompromised patients, who present with lymphadenopathy, pulmonary consolidation, and pleural effusion...
January 2017: Radiographics: a Review Publication of the Radiological Society of North America, Inc
https://www.readbyqxmd.com/read/28074660/optimizing-the-management-of-children-with-latent-tuberculosis-infection
#5
E Venturini, C Tersigni, E Chiappini, M de Martino, L Galli
The management of latent tuberculosis (LTBI) in children represents an important issue for paediatricians because of the disease burden, the lack of a gold standard for the diagnosis and the high annual risk of progression to active disease. Areas covered: A review of English language articles on LTBI in children, published between the 1(st) of January 2010 and the 1(st) of July 2016, was conducted using multiple keywords and standardized terminology in PubMed database. This review provides an updated overview of the available tests for LTBI diagnosis in children, management strategies and treatment options...
January 11, 2017: Expert Review of Anti-infective Therapy
https://www.readbyqxmd.com/read/28070206/qft-plus-a-plus-in-variability-evaluation-of-new-generation-igra-in-serial-testing-of-students-with-a-migration-background-in-germany
#6
J Knierer, E N Gallegos Morales, A Schablon, A Nienhaus, J F Kersten
BACKGROUND: Currently available Interferon-gamma release assays (IGRAs) show a considerable variability in serial testing for latent tuberculosis infection (LTBI). This study offers first results for the new generation IGRA QuantiFERON-TB Gold Plus (QFT-Plus) introduced in 2015 in comparison with its predecessor QuantiFERON-TB Gold In-Tube (QFT-GIT) from serial testing of students with a migration background at German universities. METHODS: Forty-one students were selected from a previous study...
2017: Journal of Occupational Medicine and Toxicology
https://www.readbyqxmd.com/read/28069953/c-type-lectin-receptor-dcir-modulates-immunity-to-tuberculosis-by-sustaining-type-i-interferon-signaling-in-dendritic-cells
#7
Anthony Troegeler, Ingrid Mercier, Céline Cougoule, Danilo Pietretti, André Colom, Carine Duval, Thien-Phong Vu Manh, Florence Capilla, Renaud Poincloux, Karine Pingris, Jérôme Nigou, Jörg Rademann, Marc Dalod, Frank A W Verreck, Talal Al Saati, Geanncarlo Lugo-Villarino, Bernd Lepenies, Denis Hudrisier, Olivier Neyrolles
Immune response against pathogens is a tightly regulated process that must ensure microbial control while preserving integrity of the infected organs. Tuberculosis (TB) is a paramount example of a chronic infection in which antimicrobial immunity is protective in the vast majority of infected individuals but can become detrimental if not finely tuned. Here, we report that C-type lectin dendritic cell (DC) immunoreceptor (DCIR), a key component in DC homeostasis, is required to modulate lung inflammation and bacterial burden in TB...
January 9, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28069807/an-integrated-workflow-to-assess-technical-and-biological-variability-of-cell-population-frequencies-in-human-peripheral-blood-by-flow-cytometry
#8
Julie G Burel, Yu Qian, Cecilia Lindestam Arlehamn, Daniela Weiskopf, Jose Zapardiel-Gonzalo, Randy Taplitz, Robert H Gilman, Mayuko Saito, Aruna D de Silva, Pandurangan Vijayanand, Richard H Scheuermann, Alessandro Sette, Bjoern Peters
In the context of large-scale human system immunology studies, controlling for technical and biological variability is crucial to ensure that experimental data support research conclusions. In this study, we report on a universal workflow to evaluate both technical and biological variation in multiparameter flow cytometry, applied to the development of a 10-color panel to identify all major cell populations and T cell subsets in cryopreserved PBMC. Replicate runs from a control donation and comparison of different gating strategies assessed the technical variability associated with each cell population and permitted the calculation of a quality control score...
January 9, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28065665/unbiased-identification-of-blood-based-biomarkers-for-pulmonary-tuberculosis-by-modeling-and-mining-molecular-interaction-networks
#9
Awanti Sambarey, Abhinandan Devaprasad, Abhilash Mohan, Asma Ahmed, Soumya Nayak, Soumya Swaminathan, George D'Souza, Anto Jesuraj, Chirag Dhar, Subash Babu, Annapurna Vyakarnam, Nagasuma Chandra
Efficient diagnosis of tuberculosis (TB) is met with multiple challenges, calling for a shift of focus from pathogen-centric diagnostics towards identification of host-based multi-marker signatures. Transcriptomics offer a list of differentially expressed genes, but cannot by itself identify the most influential contributors to the disease phenotype. Here, we describe a computational pipeline that adopts an unbiased approach to identify a biomarker signature. Data from RNA sequencing from whole blood samples of TB patients were integrated with a curated genome-wide molecular interaction network, from which we obtain a comprehensive perspective of variations that occur in the host due to TB...
December 21, 2016: EBioMedicine
https://www.readbyqxmd.com/read/28065210/prevalence-of-tuberculosis-infection-in-healthcare-workers-of-the-public-hospital-network-in-medell%C3%A3-n-colombia-a-bayesian-approach
#10
J Ochoa, A L León, I C Ramírez, C M Lopera, E Bernal, M P Arbeláez
A latent tuberculosis infection (LTBI) prevalence survey was conducted using tuberculin skin test (TST) and Quantiferon test (QFT) in 1218 healthcare workers (HCWs) in Medellín, Colombia. In order to improve the prevalence estimates, a latent class model was built using a Bayesian approach with informative priors on the sensitivity and specificity of the TST. The proportion of concordant results (TST+,QFT+) was 41% and the discordant results contributed 27%. The marginal estimate of the prevalence P(LTBI+) was 62·1% [95% credible interval (CrI) 53·0-68·2]...
January 9, 2017: Epidemiology and Infection
https://www.readbyqxmd.com/read/28061954/multiple-cytokine-responses-in-discriminating-between-active-tuberculosis-and-latent-tuberculosis-infection
#11
Jing Wu, Sen Wang, Chanyi Lu, Lingyun Shao, Yan Gao, Zumo Zhou, Heqing Huang, Ying Zhang, Wenhong Zhang
BACKGROUND: Cytokines play an important role in cell-mediated immune responses against Mycobacterium tuberculosis (Mtb) infection. Cytokine profile specifically associated with active tuberculosis (ATB) patients, subjects with latent tuberculosis infection (LTBI) and non-infected individuals remains to be determined. METHODS: We enrolled a total of 92 subjects including patients with ATB (n = 25), LTBI (n = 36) and healthy controls (HC, n = 31) to investigate the cytokine production by peripheral blood mononuclear cells after Mtb purified protein derivative (PPD) stimulation which was evaluated by a beads-based multiplex assay system...
January 2017: Tuberculosis
https://www.readbyqxmd.com/read/28061953/advances-in-basic-and-translational-tuberculosis-research-proceedings-of-the-first-meeting-of-report-international
#12
REVIEW
Carolina Geadas, Sonia K Stoszek, David Sherman, Bruno B Andrade, Sudha Srinivasan, Carol D Hamilton, Jerrold Ellner
RePORT International is a collaborative research network of investigators from multiple countries and institutions with the goal of establishing a bio-repository of specimens and clinical data for the study of active TB and latent TB infection (LTBI). During the first meeting of RePORT International in Boston, Massachusetts, the results of research pertinent to TB control and eradication were presented, including advances in the research of Mycobacterium tuberculosis (MTB) persistence and drug resistance, TB diagnostics, drug and vaccine development...
January 2017: Tuberculosis
https://www.readbyqxmd.com/read/28060926/comparison-of-tst-and-igra-in-diagnosis-of-latent-tuberculosis-infection-in-a-high-tb-burden-setting
#13
Surendra K Sharma, Richa Vashishtha, L S Chauhan, V Sreenivas, Divya Seth
BACKGROUND: There are currently two tests for diagnosing latent tuberculosis infection (LTBI); TST and IGRA. However, it is still unclear that which one of these tests performs better in high TB-burden settings. METHODS: 1511 household contacts of pulmonary TB patients were enrolled to compare the performance of TST and IGRA for LTBI. At baseline all participant underwent testing for IGRA [QuantiFERON-TB® Gold In-tube (QFT-GIT) assay] and TST [2 tuberculin unit (TU), purified protein derivative (PPD), RT23, Staten Serum Institute (SSI), Copenhagen, Denmark]...
2017: PloS One
https://www.readbyqxmd.com/read/28058538/factors-influencing-the-choice-of-first-and-second-line-biologic-therapy-for-the-treatment-of-rheumatoid-arthritis-real-life-data-from-the-italian-lorhen-registry
#14
Sara Monti, Catherine Klersy, Roberto Gorla, Piercarlo Sarzi-Puttini, Fabiola Atzeni, Raffaele Pellerito, Enrico Fusaro, Giuseppe Paolazzi, Pier Andrea Rocchetta, Ennio Giulio Favalli, Antonio Marchesoni, Roberto Caporali
According to international recommendations, the selection of the biologic disease modifying anti-rheumatic drug (bDMARD) for rheumatoid arthritis (RA) is mainly left to the clinician's preference. We analyzed the real-life factors influencing the first-line choice or the switching strategy, focusing on the prescription of abatacept (ABA) or tocilizumab (TCZ) compared to TNFα inhibitors (TNFi). Patients enrolled in the Lombardy Rheumatology Network (LORHEN) Registry after January 1, 2010, when all considered bDMARD agents were available, were included...
January 5, 2017: Clinical Rheumatology
https://www.readbyqxmd.com/read/28057704/mycobacterium-tuberculosis-protease-marp-activates-a-peptidoglycan-hydrolase-during-acid%C3%A2-stress
#15
Helene Botella, Julien Vaubourgeix, Myung Hee Lee, Naomi Song, Weizhen Xu, Hideki Makinoshima, Michael S Glickman, Sabine Ehrt
Mycobacterium tuberculosis (Mtb) can persist in the human host in a latent state for decades, in part because it has the ability to withstand numerous stresses imposed by host immunity. Prior studies have established the essentiality of the periplasmic protease MarP for Mtb to survive in acidified phagosomes and establish and maintain infection in mice. However, the proteolytic substrates of MarP that mediate these phenotypes were unknown. Here, we used biochemical methods coupled with supravital chemical probes that facilitate imaging of nascent peptidoglycan to demonstrate that during acid stress MarP cleaves the peptidoglycan hydrolase RipA, a process required for RipA's activation...
January 5, 2017: EMBO Journal
https://www.readbyqxmd.com/read/28052967/official-american-thoracic-society-infectious-diseases-society-of-america-centers-for-disease-control-and-prevention-clinical-practice-guidelines-diagnosis-of-tuberculosis-in-adults-and-children
#16
David M Lewinsohn, Michael K Leonard, Philip A LoBue, David L Cohn, Charles L Daley, Ed Desmond, Joseph Keane, Deborah A Lewinsohn, Ann M Loeffler, Gerald H Mazurek, Richard J O'Brien, Madhukar Pai, Luca Richeldi, Max Salfinger, Thomas M Shinnick, Timothy R Sterling, David M Warshauer, Gail L Woods
BACKGROUND: Individuals infected with Mycobacterium tuberculosis (Mtb) may develop symptoms and signs of disease (tuberculosis disease) or may have no clinical evidence of disease (latent tuberculosis infection [LTBI]). Tuberculosis disease is a leading cause of infectious disease morbidity and mortality worldwide, yet many questions related to its diagnosis remain. METHODS: A task force supported by the American Thoracic Society, Centers for Disease Control and Prevention, and Infectious Diseases Society of America searched, selected, and synthesized relevant evidence...
January 15, 2017: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/28046053/human-and-mouse-hematopoietic-stem-cells-are-a-depot-for-dormant-mycobacterium-tuberculosis
#17
Julia Tornack, Stephen T Reece, Wolfgang M Bauer, Alexis Vogelzang, Silke Bandermann, Ulrike Zedler, Georg Stingl, Stefan H E Kaufmann, Fritz Melchers
An estimated third of the world's population is latently infected with Mycobacterium tuberculosis (Mtb), with no clinical signs of tuberculosis (TB), but lifelong risk of reactivation to active disease. The niches of persisting bacteria during latent TB infection remain unclear. We detect Mtb DNA in peripheral blood selectively in long-term repopulating pluripotent hematopoietic stem cells (LT-pHSCs) as well as in mesenchymal stem cells from latently infected human donors. In mice infected with low numbers of Mtb, that do not develop active disease we, again, find LT-pHSCs selectively infected with Mtb...
2017: PloS One
https://www.readbyqxmd.com/read/28043788/comparison-of-bacteriological-conversion-and-treatment-outcomes-among-mdr-tb-patients-with-and-without-diabetes-in-mexico-preliminary-data
#18
M Muñoz-Torrico, J Caminero Luna, G B Migliori, L D'Ambrosio, J L Carrillo-Alduenda, H Villareal-Velarde, A Torres-Cruz, H Flores-Ergara, D Martínez-Mendoza, C García-Sancho, R Centis, M Á Salazar-Lezama, R Pérez-Padilla
: Diabetes mellitus (DM) is a well-known risk factor for tuberculosis (TB). However, it is not known to what extent DM affects the outcome in patients with multidrug-resistant (MDR-TB) and extensively drug-resistant TB (XDR-TB) treated with second-line anti-TB drugs. The objective of this study was to compare the microbiological evolution (sputum smear and culture conversion) and final outcomes of MDR/XDR-TB patients with and without DM, managed at the national TB reference centre in Mexico City...
December 30, 2016: Revista Portuguesa de Pneumologia
https://www.readbyqxmd.com/read/28043637/importance-of-the-%C3%AE-10-helix-for-devr-activation-a-road-map-for-screening-inhibitors-against-devr-mediated-dormancy-of-mycobacterium-tuberculosis
#19
Atul Vashist, D Prithvi Raj, Umesh Datta Gupta, Rajiv Bhat, Jaya Sivaswami Tyagi
OBJECTIVE/BACKGROUND: Bacterial persistence is the hallmark of tuberculosis (TB) and poses the biggest threat to the success of any antitubercular drug regimen. The DevR/DosR dormancy regulator of Mycobacterium tuberculosis belongs to the NarL subfamily of response regulators and is essential for M. tuberculosis persistence in macaque models of TB. The DevR/DosR crystal structure revealed a unique (αβ)4 topology instead of the classical (αβ)5 structure found in the receiver domain of other regulators in this subfamily...
December 2016: International Journal of Mycobacteriology
https://www.readbyqxmd.com/read/28043634/mycobacterial-excretory-secretory-31-protein-with-serine-protease-and-lipase-activities-an-immunogen-and-drug-target-against-tuberculosis-infection
#20
Bhaskar C Harinath
OBJECTIVE/BACKGROUND: Tuberculosis (TB) has been declared as a global emergency by the World Health Organization in 1993 and still remains one of the world's biggest threats. Worldwide, 9.6 million people have been estimated to have fallen ill with TB in 2014: 5.4 million men, 3.2 million women, and 1.0 million children. To reduce this burden, detection and treatment gaps must be addressed and new tools developed (Global TB report 2015). METHODS: Seroreactivity of the purified excretory secretory (ES) antigens ES-31, ES-43, ES-41, and ES-6 have been assessed in pulmonary TB (fresh, relapse, chronic, and latent), extrapulmonary TB, and in human immunodeficiency virus-TB coinfection...
December 2016: International Journal of Mycobacteriology
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